You age up with 14 villagers (5 start + 3 crates + 6 trained) and you send the Advanced native scout card, while your army is fighting off his army(distracting), you can swoop in with your invisible scouts and raid villagers, this will cause your opponent to lose confidence in leaving villagers outside of their town center and you can win by draining your opponent.

This works only if you have an army big/strong enough to impose a distraction.

Best part of this strategy is that its cross-compatible with the other native American civilizations.

Edit: with Aztec, you can do invisible coyotes or the scouts (coyotes cost wood scouts only food your choice) with sioux, the only invisible unit they get are Tashunke prowlers, so better to have invisible guys in age 2 than age 3...